22/3÷2/15×6/5=22/3×15/2×6/5=11/1×5/1×6/5=55/1×6/5=11/1×6/1= 66
200-40%
х- 100%
х=200*100:40=500уч- страших классов
500+200=700уч-всего в школе
2ᵃ = 3
9 = 3² = (2ᵃ)² = (2²)ᵃ = 4ᵃ
4ᵃ + 1 = 9 + 1 = 10
2целых3/7*7=17*7/7=17
(2/9+1целая2/3)*3=(2+15/9)*3=17/3=5целых2/3
5/12*2=5/6